Engine exhaust noise is a main source for construction machinery noise, and it has a very significant impact on the level of construction machinery noise.

发动机排气噪声是工程机械整机噪声中最主要的噪声源，对于工程机械整机噪声水平的高低有重要的影响。

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Machinery noise control technology applications in the ship can not only improve the human work environment, but also improve the performance of ship stealth.

机械噪声控制技术在舰船上的应用不但可以改善人机工作环境，而且还可以提高舰船隐身性能。

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Then the pipe system becomes the main noise resource of quite submarine, when propeller noise, hydrodynamic noise and machinery noise of facility base are controlled effectively.

指出螺旋桨噪声、水动力噪声和设备机座机械噪声被有效抑制后，管道系统便成为“安静型”潜艇的主要噪声源。

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Almost everything stays at eye level or below, and there are conveyors in only one spot, meaning less machinery that might need attention (and less noise).

FORBES: Magazine Article

The scandal machinery has kicked into high gear, and its sheer noise may drown out everything else.

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Michigan's Department of Environmental Quality looked last year at whether the companies at Zug started up any new machinery in the past two years that might be causing the noise and found nothing.

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